US 2300506 A
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Filed Nov. 5, 1940- l l l Patented Nov. 3, 1942 WINDOW coN'sTaUc'rroN James W. Kamerer, New Kensington, Pa., assignor to Pittsburgh Plate Glass Company, Allegheny County, Pa., a corporation of Pennsylvania Application November 5, 1940, Serial No. 364,434- 2 Claims. (CIL 189--64) The present invention relates to glazing structures and more particularly to a window construction in which laminated glass is employed as the glazing medium.
One object of the present invention is the provision of a window construction in which an intermediate air space is sealed from the atmosphere and a metal barrier reinforces the seal to assist in restricting the passage of water vapor therethrough.
Other objects and advantages of the invention will become more apparent from the following detailed description of a preferred embodiment thereof.
Double glazing, which has become of increased importance in building constructions, has been the subject of considerable development. Many borders 8.
. plates Il held to the frame by bolts l2 at spaced forms of double glazed units have been suggested heretofore but in all there has remained unsolved the problem of sealing the unit so as .to preclude the admission therein of water vapor. The first forms of insulating windows contained spaced plates of glass having a vitreous edge seal. It was observed. however, that variations in temperature and pressure occasioning the so-'called breathing action of the unit destroyed the seal and impaired its insulating value. ,A further development entailed the formation of a unit wherein a resilient sealing medium was employed and provision was made for removing any water vapor which would enter the unit. This could be accomplished by the addition of desiccantsor the replacement of moist air by anhydrousv air.
The lack of satisfactory sealing media caused a substantial abandonment of the original line of endeavor and there wasja trend toward demountable units in which'one of the plates of glass could be removed for cleaning and reconditioningthe surfaces of the glass plates. In this type of unit there'wa's also provided containers for a dehydrating material in order that the concentration of water vapor could be maintained at a satisfactory minimum.
Briefly stated the present invention con templates the formation of a sealed window unit employing plates of laminated glass in which the reinforcing interlayer material extendsbeyond the edges of the glass and serves to securer the laminated plates to'a suitable frame. The rein- Referring to the drawing, awindow construction I comprises a frame 2, of metal or wood, provided `with rabbets 3 extending around the inner boundary thereof. Plates 4 of laminated glass have a plastic reinforcing interlayer 6 extending beyondthe edges of the glass laminae to form Ribbons 9 lof continuous metal foil are encased within the plastic reinforcing material adjacent the edges thereof and are of suf' 'A flcient width to project inwardly between the glass laminae. The laminated plates are secured Within the rabbets 3 of the frame through the extending reinforcing 'material by means of intervals therealong.
It will be observed that-in the disclosed con- K. struction, the space between the laminated plates 4 is substantially sealed from the surrounding atmosphere by clamping the border 8 to thev frame 2. The metallic foil 9 encasedin the reinforcing material restricts the passage `of moisture therethrough and thus increases the effectiveness of the seal; It is, of course, possible that some water vapor might move gradually through the reinforcing material around the metal foil 9, but thisl path is of suchlen'gth that the infiltration of water vapor would be exceedyond the edges of the glass laminae,` means for securing in spaced relation the laminated plates to opposite sides of the frame through the ex-.- tending reinforcing material, and a metallic barrier encased within the reinforcing interlayer material adjacent its edges to restrict the infiltration of water vapor therethrough into the space between the laminated plates. Y
2. A window construction comprising a fram rabbets on opposite sides of the frame extending around the inner boundary thereof. a plurality of plates o f laminated glass having a reinforcingv interlayer material extending beyond the edges of the glass laminae, a'P continuous ribbon of -metal foil encased in the reinforcing interlayer adjacent the outer edge thereof and of sui'cient width to project inwardlybetween the glass laminae, and means for securing the laminated plates in spaced relation within the rabbets of the frame through the extending reinforcing material. 4
` JAMES W. KAMERER.
or, the scope of the